I enjoyed the application of family systems to marriage conflict in a lot of ways, especially the verbatim pieces of the book.
I think theologically and pastorally, there are a few things here I can't get with and find this to be inadequate. A big part of this relates to the importance of what's involved in reconciliation and conflict. I think there is more possible for couples in conflict, especially Christian couples, than just long-term working on personal functioning.
So a helpful systems theory exploration. But it's essentially a gospel-less pastoral counseling approach - so expectations, theology, and roles will impact how one thinks about this approach for couples in such deep conflict. I learned some great nuggets, but ultimately found it lacking for the kind of reconciliation work with couples I would hope to be a part of.